Browser Version Total Market Share Extracellular-Growth factor and receptor 4.78% Extracellular-Cytokine and receptor 5.44% Extracellular-G protein-coupled receptor 5.50% Extracellular-Ion channel protein 1.50% Extracellular-Transporter 0.94% Extracellular-Toll-like receptor 0.37% Extracellular-Other membrane receptor 1.59% Extracellular-TIMP/MMP 1.12% Extracellular-Extracellular enzyme 1.50% Extracellular-Surface antigen 1.03% Extracellular-Secreted protein 6.00% Extracellular-Adhesion protein 1.22% Extracellular-Other 1.41% Intracellular-Enzyme 17.43% Intracellular-Nuclear receptor 2.06% Intracellular-Other transcription factor 7.97% Intracellular-Adapter protein 0.66% Intracellular-Actin-binding protein 0.56% Intracellular-Other intracellular receptor 0.84% Intracellular-RNA binding protein 0.37% Intracellular-Structural protein 0.84% Intracellular-Ribosomal protein 0.19% Intracellular-Epigenetics 14.32% Intracellular-Other 8.06% Both-Enzyme 0.84% Both-Transcription factor 0.28% Both-Other 2.16% Other-127 11.90%